just heard from the permit guy. He's insisting on a double wall heat exchanger and recommends I contact solarbc.ca... that's the organization that pushes pro installs starting at way more then $1200 for systems that will do half as much. Next step is to contact them and find an inexpensive double wall heat exchanger. I'm not sure if I can do double wall and drain back and frankly adding the antifreeze to the system vs regular water is a lot worse in my mind anyways.
I'm not happy.
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